He wants to push the mouse forward and backwards instead of using the standard "3-click" style swing.
I've yet to see this work well online because there is generally a timing issue between analog style swings and the internet. TW Online Beta just released a Trueswing component recently, and to be honest, it's not done all that well. If there's any kind of lag the game thinks you pushed the mouse forward at light speed. You end up wailing the shot much harder than you wanted. This really burns you on the greens, especially when you blow it 50 feet beyond the hole.